hasn't struggled is in gaining the endorsements of key republicans, including new jersey governor chris christie, senator john mccain and former florida governor jeb bush. today romney will be in texas to pick up the support of president george h.w. bush. last night romney added the endorsement of one of the gop's rising stars. florida senator marco rubio threw his support behind mitt romney on fox news wednesday night. >> not only because he's going to be the republican nominee but he offers at this point such a stark contrast to the president's record. >> rubio, who is in his first term in the senate, has been tauted as a potential running mate for the event actual nominee, but last night he says he's focused on his current job. despite romney's momentum, the fight for republican votes goes on. rick santorum spent the day campaigning in wisconsin ahead of next week's primary. meanwhile, newt gingrich was in washington one day after he announced he was cutting his campaign staff. and the former house speaker got more bad news. sheldon addleson, casino mogul, told the website jewishjournal.com,